Searching elements of an array in JavaScript

Question

I have two arrays, A = [22,33,22,33] and B = [3,10,5,9].

I want to create a new array like this C = [22,max(3,5), 33, max(10,9)]

Could someone help! Thanks in advance

• Ry-: What’s the logic for picking those?
• Anurag: does both the arrays will be of same size always and you want to take maximum at those two specific points always?
• sevenfold: When findingequal elmnts in the array A go and search in the the array B the max corresponding to these elmts
• caramba: Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.
• sevenfold: Yes the same size

Answer 1

You could group by the values of array a and take the values of b at the same index of a for grouping.

var a = [22, 33, 22, 33],
 b = [3, 10, 5, 9],
 groups = new Map(),
 result;
 
a.forEach(g => groups.set(g, -Infinity)); // prevent zero false values
b.forEach((v, i) => groups.set(a[i], Math.max(groups.get(a[i]), v)));
result = [].concat(...groups);
console.log(result);